I have a 351W with a Ford 1G 15 volt 55 amp #D20F-10300-EB alternator. I'm looking to upgrade it to 100+ amps. I could go to a 3G, but I don't know whether I would need to change mounting brackets, and I'd like to avoid that.
In researching 1G units, there are 2 models, 7074 and 7078. What's the difference, and is it important for my application?
Also this alternator parts house has a 130A upgrade kit for a 1G. Would this be a good alternative to buying a new one from Summit or Jegs?
More background if needed: The 351W is a replacement engine put into a 69 Mustang. I think the engine came from a late 80-early 90s F-150 (someone else did the swap before I got it, so I don't have a specific year). The present alternator works, but the voltage drops enough when I'm running lights, wipers, turn signal, radio, then step on the brakes -- the radio shuts down for low voltage. Thankfully, the car keeps running, but I definitely need more amperage.